Vacuum refrigerator



June 16, 1925. 1,541,945

w. H. w. HAMILTON VACUUM REFRIGERATOR Filed April 12.. 1924 INVENTDR. W-H.W.HAMIUTDN.

Patented June 16 1925.

UNITED STATES PATENT OFFICE.

WILLIAM H. W. HAMILTON, ROCHESTER, NEW YORK, ASSIGNOR F ONE-HALF TO JOSEPH H. HUNTSMAN, OF SAN FRANCISCO, CALIFORNIA.

VACUUM REFRIGERATQR.

Application filed April 12, 1924. Serial No. 706,028.

tors provided with means of insulation of a character insuring the least possible radiation, and has for a principal object the employment of principles of construction that will reduce to a minimum the outflow and l inflow of heat from the storage compart ments of refrigerators, through the enclosure of such compartments within double walls enclosing a vacuum and this vacuum, in turn, enclosed within a third spaced wall, thus affording an air-space as between atmosphere and vacuum. Tofurther reduce radiation across both airspace and vacuum-space, insulation substances are provi ed for the exterior surface of the outerwall of the double walls enclosing the vacuum and the interior surface of the third wall, aswellas reflective surfaces for the interiors of the walls of the claim as new, and desire to secure by Letvacuum-space. In the accompanying drawin forming a part of this specification'ani in which similar characters of reference refer to like parts, throughout, 7

Figure 1 1s a view, in perspective, with walls broken away to disclose their arrangement, the relative positions of ice and storage compartments, air-pum "connection with vacuum, and gauge or indicatmg degree of vacuum;

Figure 2 is a broken-into side elevation,

showing air-space, vacuum-space, air-pump, gauge, ice-compartment and storage-com 'partment.

Figure 3 is a mid-section of a modification, or simplified form of construction, in which the air-space has been dispensed with, the vacuum-space remaining as the only means of retardation to radiation; and- Figure 4 is a detail of an air-pump valve. Referring more particularly to the drawings, 1 indicates a refrigerator, 2 the icecompartment, 3 the storage compartment, 4 the vacuum-space, 5 and 6 the walls thereof, 7 the air-space, 6 and 8 the walls thereof, 9 and 10 doors opening respectively to ice and storage compartments, 11 an air-pump having a ball-check plunger for lowering the pressure within the vacuum-space in the event of the intrusion of air through leakage, 12 a pressure gauge, connecting with the vacuum-space, for determining whatever degree of pressure there may be within this space, and 13, ll reflective surfaces of the vacuum-space walls, aifording, as constructional features, additional bad radiation elements. Figure3, no, factor other than that of the vacuum-space is employed as a means for the prevention of radiation, providing a less expensive refrigerator, though at the cost of a slightly increased radiation. As is to be observed, the more perfect the means for the prevention of radiation, the more highly eflicient the device becomes as a refrigerant, a small amount of ice under conditions thus provided proving suflicient for ample refrigeration over an extended period.

Having thus described my invention, I

ters Patent:

ln the modification, as presented in' 1. A refrigerator having a chamber surrounded by double walls enclosin a vacuum, said chamberbeing divide into an ice-compartment and a storage-compartment, openingsleadingrespectively into said compartments, closures for said openings comprised respectively of double walls also enclosing" vacuum-spaces a third wall spaced from and enclosing said double walls and providing an air-space therebetween, an

air-pump mounted Within said vacuumspace for securing and maintaining vacuum within said vacuum-space, and a gauge for indicating the degree of vacuum within said space.

2. A refrigerator having a chamber sillrounded by double walls enclosing a' vacuum, the said walls being provided with reflective surfaces and the said chamber being divided into an ice-compartment and a storage, cumpew'umenu, dluors, as closures 20? said openings, comprisfl respectively 01 &0uble Walls enclosing vacuums, a thifl WC'LH spas-ad from anal enclosing said double 0 Walls and providing an air-space therebs- @WGEBD, an air-uump mounted within said vacuum-spam 1 0-1 securing and maintaining vacuum Within saM vucuum-space, saisi pump having a, ball-check plunger adapt/36L to hold the vzzcuum and a gauge E01 inclicating the degree of vacuum Within said space.

AMLELTQN. 

